/*
 * The MIT License
 * 
 * Copyright (c) 2011 Takahiro Hashimoto
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.taobao.top.link.embedded.websocket.handshake;

import java.nio.ByteBuffer;

import com.taobao.top.link.embedded.websocket.HttpHeader;
import com.taobao.top.link.embedded.websocket.util.StringUtil;

/**
 * The Class HttpResponseHeaderParser.
 *
 * @author Takahiro Hashimoto
 */
public class HttpResponseHeaderParser {

  /** The response header. */
  private HttpHeader responseHeader = new HttpHeader();

  /** The complete. */
  private boolean    complete       = false;

  /**
   * Parses the.
   *
   * @param buffer
   *          the buffer
   */
  public void parse(ByteBuffer buffer) {
    if (complete) {
      throw new IllegalStateException("Parser already parse completed");
    }
    do {
      String line = StringUtil.readLine(buffer);
      if (line == null) {
        return;
      }
      if (line.indexOf(':') > 0) {
        String[] keyValue = line.split(":", 2);
        if (keyValue.length > 1) {
          responseHeader.addHeader(keyValue[0].trim(), keyValue[1].trim());
        }
      }
      if ("\r\n".compareTo(line) == 0) {
        complete = true;
        return;
      }
      if (!buffer.hasRemaining()) {
        return;
      }
    } while (true);
  }

  /**
   * Checks if is completed.
   *
   * @return true, if is completed
   */
  public boolean isCompleted() {
    return complete;
  }

  /**
   * Gets the response header.
   *
   * @return the response header
   */
  public HttpHeader getResponseHeader() {
    return responseHeader;
  }
}
